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…meContext and add TaskInfo to hold all task related parameters. This closes #1386
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flink-core/src/main/java/org/apache/flink/api/common/TaskInfo.java
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
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| package org.apache.flink.api.common; | ||
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| import static com.google.common.base.Preconditions.checkArgument; | ||
| import static com.google.common.base.Preconditions.checkNotNull; | ||
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| /** | ||
| * Encapsulates task-specific information: name, index of subtask, parallelism and attempt number. | ||
| */ | ||
| public class TaskInfo { | ||
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| private final String taskName; | ||
| private final String taskNameWithSubtasks; | ||
| private final int indexOfSubtask; | ||
| private final int numberOfParallelSubtasks; | ||
| private final int attemptNumber; | ||
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| public TaskInfo(String taskName, int indexOfSubtask, int numberOfParallelSubtasks, int attemptNumber) { | ||
| checkArgument(indexOfSubtask >= 0, "Task index must be a non-negative number."); | ||
| checkArgument(numberOfParallelSubtasks >= 1, "Parallelism must be a positive number."); | ||
| checkArgument(indexOfSubtask < numberOfParallelSubtasks, "Task index must be less than parallelism."); | ||
| checkArgument(attemptNumber >= 0, "Attempt number must be a non-negative number."); | ||
| this.taskName = checkNotNull(taskName, "Task Name must not be null."); | ||
| this.indexOfSubtask = indexOfSubtask; | ||
| this.numberOfParallelSubtasks = numberOfParallelSubtasks; | ||
| this.attemptNumber = attemptNumber; | ||
| this.taskNameWithSubtasks = taskName + " (" + (indexOfSubtask + 1) + '/' + numberOfParallelSubtasks + ')'; | ||
| } | ||
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| /** | ||
| * Returns the name of the task | ||
| * | ||
| * @return The name of the task | ||
| */ | ||
| public String getTaskName() { | ||
| return this.taskName; | ||
| } | ||
|
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| /** | ||
| * Gets the number of this parallel subtask. The numbering starts from 0 and goes up to | ||
| * parallelism-1 (parallelism as returned by {@link #getNumberOfParallelSubtasks()}). | ||
| * | ||
| * @return The index of the parallel subtask. | ||
| */ | ||
| public int getIndexOfThisSubtask() { | ||
| return this.indexOfSubtask; | ||
| } | ||
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| /** | ||
| * Gets the parallelism with which the parallel task runs. | ||
| * | ||
| * @return The parallelism with which the parallel task runs. | ||
| */ | ||
| public int getNumberOfParallelSubtasks() { | ||
| return this.numberOfParallelSubtasks; | ||
| } | ||
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| /** | ||
| * Gets the attempt number of this parallel subtask. First attempt is numbered 0. | ||
| * The attempt number corresponds to the number of times this task has been restarted(after | ||
| * failure/cancellation) since the job was initially started. | ||
| * | ||
| * @return Attempt number of the subtask. | ||
| */ | ||
| public int getAttemptNumber() { | ||
| return this.attemptNumber; | ||
| } | ||
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| /** | ||
| * Returns the name of the task, appended with the subtask indicator, such as "MyTask (3/6)", | ||
| * where 3 would be ({@link #getIndexOfThisSubtask()} + 1), and 6 would be | ||
| * {@link #getNumberOfParallelSubtasks()}. | ||
| * | ||
| * @return The name of the task, with subtask indicator. | ||
| */ | ||
| public String getTaskNameWithSubtasks() { | ||
| return this.taskNameWithSubtasks; | ||
| } | ||
| } |
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